The instantaneous value of emf and current in an
A.C. circuit are; $E = 1.414 s i n (100 π t - \frac{π}{4})$ ,
$I = 0.707 s i n (100 π t)$ . The current,

leads the voltage by

45^{0}

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lags behind the voltage by

45^{0}

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leads the voltage by

90^{0}

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lags behind the voltage by

90^{0}

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Solution

The correct option is A leads the voltage by $45^{0}$
$I = 0.707 s i n (100 π t)$
$V = 1.414 s i n (100 π t - \frac{π}{4})$
So, current leads voltage by $45^{0}$ .

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